GSEARA(3g,L)                AIX Technical Reference                GSEARA(3g,L)



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gseara



PURPOSE

Draws an elliptical arc between two angles.

C SYNTAX

int gseara_ (cx, cy, ma, mi, ang, sa, ea)

int *cx, *cy, *ma, *mi, *ang, *sa, *ea;

FORTRAN SYNTAX

INTEGER function gseara (cx, cy, ma, mi, ang, sa, ea)

INTEGER cx, cy, ma, mi, ang, sa, ea

PASCAL SYNTAX

FUNCTION gseara_ (

VAR cx, cy, ma, mi, ang, sa, ea : INTEGER
): INTEGER [PUBLIC];

DESCRIPTION

The gseara subroutine draws a counterclockwise elliptical arc of the specified
axes and angle from the beginning point defined by an angle specification to
the ending point defined by an angle specification.  The axes are expressed in
number of pixels.

The angle specifications are given in tenths of degrees, from 0 to 3600.
Values outside this range cause the gseara subroutine to fail.

The relevant attributes are:

  o Color map
  o Plane mask
  o Line color index
  o Line style
  o Logical operation.

Parameters

cx, cy   Define the coordinates of the center of the ellipse.

         For displays, the center is restricted to -2048 to 2048.




Processed November 7, 1990       GSEARA(3g,L)                                 1






GSEARA(3g,L)                AIX Technical Reference                GSEARA(3g,L)



         For printers and plotters, the center is restricted to screen
         coordinates.

ma, mi   Define half of the nonzero major and minor axes of the ellipse.

ang      Defines the angle between the major axis and the x-axis.  If ang is 0,
         the major axis is on the x-axis and the minor axis is on the y-axis.
         The angle is expressed in tenths of degrees, from 0 to 3600.

sa       Defines the angle of the starting point of the elliptical arc,
         measured counterclockwise from the major axis.  The angle is expressed
         in tenths of degrees, from 0 to 3600.

ea       Defines the angle of the ending point of the elliptical arc, measured
         counterclockwise from the major axis.  The angle is expressed in
         tenths of degrees, from 0 to 3600.

If the beginning and ending points are identical, a full ellipse is drawn.

RETURN VALUE

GS_SUCC  Successful.
GS_CORD  Invalid coordinate.
GS_ELMM  Invalid major or minor axis.
GS_INAC  Virtual terminal inactive.
GS_ANGL  Invalid angle.
GS_NMEM  No memory available.




























Processed November 7, 1990       GSEARA(3g,L)                                 2